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LTC3561AIDD-TRPBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC3561AIDD-TRPBF Datasheet(HTML) 7 Page - Linear Technology |
7 / 20 page LTC3561A 7 3561af SHDN/RT (Pin 1): Combination Shutdown and Timing Resistor Pin. The oscillator frequency is programmed by connecting a resistor from this pin to ground. Forcing this pin to SVIN causes the device to be shut down. In shutdown all functions are disabled. SGND (Pin 2): Signal Ground. All SGND and PGND pins must be connected together through a thick copper trace or ground plane. SW (Pin 3): The Switch Node Connection to the Inductor. This pin swings from PVIN to PGND. PGND (Pin 4): Power Ground. Connect to the (–) terminal of COUT, and (–) terminal of CIN. All SGND and PGND pins must be connected together through a thick copper trace or ground plane. PVIN (Pin 5): Main Supply Pin. Must be closely decoupled to PGND. PIN FUNCTIONS SVIN (Pin 6): The Signal Power Pin. All active circuitry is powered from this pin. Must be closely decoupled to SGND. SVIN must be greater than or equal to PVIN. VFB (Pin 7): Receives the feedback voltage from the ex- ternal resistive divider across the output. Nominal voltage for this pin is 0.8V. ITH(Pin8):ErrorAmplifierCompensationPoint.Thecurrent comparator threshold increases with this control voltage. Nominal voltage range for this pin is 0.4V to 1.4V. Exposed Pad (Pin 9): Signal Ground. All small-signal components and compensation components should be connected to this ground (see Board Layout Consider- ations). Must be soldered to electrical ground on PCB. All SGND and PGND pins must be connected together through a thick copper trace or ground plane. NOMINAL (V) ABSOLUTE MAX (V) PIN NAME DESCRIPTION MIN TYP MAX MIN MAX 1 SHDN/RT Shutdown/Timing Resistor –0.3 0.8 SVIN –0.3 SVIN + 0.3 2 SGND Signal Ground 0 3 SW Switch Node 0 PVIN –0.3 PVIN + 0.3 4 PGND Main Power Ground 0 5PVIN Main Power Supply –0.3 5.5 –0.3 SVIN + 0.3 6SVIN Signal Power Supply 2.5 5.5 –0.3 6 7VFB Output Feedback Pin 0 0.8 1.0 –0.3 SVIN + 0.3 8ITH Error Amplifier Compensation and Run Pin 0.4 1.4 –0.3 SVIN + 0.3 |
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